Access 134,893 building permits issued in King County, Washington through a single REST API. Refreshed daily from the official King County open data portal and normalized into a consistent schema.
Most common permit types issued in the last year.
Most active contractors by permit volume in King County.
The 10 most recent permits issued in King County, Washington. Full dataset available via REST API.
| Issued | Permit # | Address | Category | Description |
|---|---|---|---|---|
| 2026-08-09 | OSS-PR-9012027-2026 | 13239 SE 91ST ST | Renovation | Pressurized System (New)-Single Family |
| 2026-08-09 | TFE-BO-9012028-2026 | — | Other | Minimal - Unlimited |
| 2026-08-09 | PGP-BFP-9012024-2026 | 4437 RAINIER AVE S | Plumbing | Backflow Assembly |
| 2026-08-08 | TFE-BO-9012015-2026 | — | Other | Complex - Single |
| 2026-08-08 | PGP-PLB-9012014-2026 | 9803 57th Ave S 9803 57th Ave S | Plumbing | Plumbing DIY Residential |
| 2026-08-08 | TFE-BO-9012013-2026 | — | Other | Complex - Single |
| 2026-08-08 | TFE-BO-9011937-2026 | — | Other | Complex - Single |
| 2026-08-07 | WRF-COF-9011993-2026 | 3636 EVANSTON AVE N | Plumbing | Drain Cover Replacement |
| 2026-08-07 | OSS-PR-9011992-2026 | 18238 NE 194TH ST | Renovation | Pressurized System (New)-Single Family |
| 2026-08-07 | OSS-PR-9011932-2026 | 27128 SE 432ND ST | Renovation | Pressurized System (New)-Single Family |
Query King County, Washington permits with a single HTTP request. Returns JSON with address, category, status, dates, and full description.
# Search all King County permits issued this month curl -H "X-API-Key: YOUR_KEY" \ "https://api.permit-stack.com/v1/permits/search?city=King%20County&state=WA&issued_after=2026-04-01"
Related coverage in Washington and nationwide.
We ingest data directly from the official King County open data portal (the official city portal) daily. This is the same source used by the city's own public dashboards, normalized into a consistent JSON schema across our U.S. jurisdictions.
Our automated ingestion runs daily at 03:00 UTC. The latest permit in our database for King County, Washington was issued on August 9, 2026. Permit backlogs on the city side may mean some permits take a few days to appear.
Yes — our free tier includes 100 requests per day, enough to search and filter King County permits interactively. Sign up for a free API key to get started.
Yes. CSV export is available on every plan, including free, with the row cap rising by tier. Real-time webhooks for changed permits are on the Developer plan and above.
Most King County permits are issued on the same day they are filed, reflecting electronic submission and same-day processing for routine permit types. Larger or more complex projects (new construction, major additions) often take longer.
Free tier covers 100 requests per day. No credit card required.
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